CLASSIFICATION OF PALAMNAEUS (SCORPION)​

KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)

PHYLUM :- ARTHROPODA (Jointed appendages.)

CLASS :- ARACHNIDA (Terrestrial or aquatic arthropods with book-lungs or trachea and without antennae, mandibles and jaws. )

ORDER :- SCORPIONIDA (Embolobranchiates in which the prosoma bealS 3-jointed chelicerae and chelate pedipals. )

FAMILY :- SCORPIONIDAE (Burrowing scorpions or pale-legged scorpions)

GENUS :- Palamnaeus (Scorpion)

GEOGRAPHICAL DISTRIBUTION

  • It has cosmopolitan distribution and specially found in India, Europe and U.S.A.

HABIT AND HABITAT

  • It is a nocturnal arthropod, found in sand, crevices and under stones and in bark of dead trees. It feeds on insects and spiders which they often kill with the sting.

PALAMNAEUS (SCORPION)​ DIAGRAM ARTHROPODA

GENERAL CHARACTERSTICS OF PALAMNAEUS (SCORPION)​

  • Commonly called as scorpion
  • Body is elongated, segmented and differentiated into anterior prosoma and posterior opisthosoma. 
  • Coloration is dark in most species, often uniformly brown or black, sometimes with a greenish shine, with brighter-colored telson, walking legs, and/or pedipalp pincers in some species.
  • Opisthosoma is sub-divided into a broad anterior mesosoma and a narrow posterior metasoma.
  • Prosoma is covered dorsally by a carapace and its appendages are a pair of small chelate chelicerae, a pair of large chelate pedipalps, 4 pairs of walking legs and several ocelli. 
  • Body is encased in chitinous covering. The dorsal side covering is called as tergum, side one pleuron and ventral one sternum. 
  • Mesosoma is composed of 7 broad segments and metasoma of 5 narrow segments.
  • Last metasomatic segment is telson containing a sting. Ventrally the sternum of first mesosomatic segment contains a pair of genital openings. The second meso somatic sternum bears a pair of sensory pectines, while third, fourth, fifth and sixth mesosomatic segments contain 4 pairs of bilateral stigmata, which are the openings of the respiratory booklungs. Metasoma is limbless. 
  • Just beneath chelicerae there are I and II gnathobases. 
  • Sexes are separate but without sexual dimorphism.
  • Viviparous.
PALAMNAEUS (SCORPION)​ DIAGRAM ARTHROPODA

SPECIAL FEATURES

  • Scorpions are harmful to mankind; its sting causes extreme pain. fever and in some cases collapse. The sting has a poison duct from the sting gland present in telson. Other common forms are Buthus and Centrurus.

IDENTIFICATION

  • The animal has prosoma, mesosoma, metasoma and all above features, hence it is Scorpion.

PALAMNAEUS (SCORPION)​ DIAGRAM ARTHROPODA
PALAMNAEUS (SCORPION)​ DIAGRAM ARTHROPODA
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